Note 15 - Segment Information - Segment Reporting Information by Capital Expenditures and Assets (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Capital expenditures	$ 4,235	$ 2,399
Assets	677,967		$ 649,555
Flat Products Segment [Member]
Capital expenditures	3,981	1,598
Assets	456,058		432,566
Tubular and Pipe Products [Member]
Capital expenditures	254	801
Assets	220,854		215,841
Corporate Segment [Member]
Capital expenditures
Assets	$ 1,055		$ 1,148